[libc-commits] [libc] [libc] [doc] explain the need of `clang` (PR #74855)

[via libc-commits]

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@@ -60,9 +60,12 @@ to use the freshly built lld and compiler-rt.
 We will go over some of the special options passed to the ``cmake`` command
 above.
 
-* **Enabled Projects** - Since we want to build and install clang, lld
-  and compiler-rt along with the libc, we specify
-  ``clang;libc;lld;compiler-rt`` as the list of enabled projects.
+* **Enabled Projects** - Since we want to build and install ``clang``, ``lld``
+  and ``compiler-rt`` along with the ``libc``, we specify
+  ``clang;libc;lld;compiler-rt`` as the list of enabled projects. ``clang`` is 
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michaelrj-google wrote:

yes, I think the runtimes build can't build headergen right now. I'm not sure if we should update the commands to recommend using the runtimes build yet, due to the specific issue you ran into of not being able to build headergen. Once we have a standalone headergen then it seems like a good idea.

https://github.com/llvm/llvm-project/pull/74855